JP2017200258A - Rotary electric machine, and manufacturing method of rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To electrically connect a center hole conductor for supplying power to a coil of a rotor and a conductor outside of a center hole while securing a sufficient contact area.SOLUTION: A rotary electric machine is a gas-cooling type rotary electric machine in which cooling gas flows between a rotor and a stator. The rotor comprises: a shaft on which a center hole along a rotation center of the rotor and a stud hole radially communicating from the center hole to an outer peripheral surface of the rotor in a machine inside end of the center hole are formed; at least a pair of center hole conductors which are electrically insulated from the shaft and inserted into the center hole along the rotation center while being electrically insulated from each other and include protrusions that protrude closer to an end portion of the shaft; and at least a pair of terminal conductors which are provided at a terminal side of the shaft while being electrically insulated from the shaft and are electrically connected with side faces of the protrusions in the at least pair of center hole conductors defined as electric connection planes.SELECTED DRAWING: Figure 3

Description

  Embodiments described herein relate generally to a rotating electrical machine and a method for manufacturing the rotating electrical machine.

  The rotor of a rotating electrical machine has a drive connected to one end, and the other end excites the rotor's iron core so that power is externally applied to a current collecting ring installed at the end of the rotor. The power is supplied to the rotor coil through a stud inserted in a radially drilled hole in the shaft and a center hole conductor inserted in the shaft center hole. As the output of the rotating electrical machine increases, this power also increases, and the current flowing through the rotor coil also increases. In recent years, in order to improve the thermal efficiency of equipment, a system in which a drive machine is connected to both ends of a rotor of a rotating electrical machine and a driving torque is transmitted from the end of a current collecting ring has been adopted. The transmission torque has also increased at the end on the side that supplies power to the magnetic circuit.

  Also, in the system that eliminates the current collecting ring and instead connects a brushless exciter to the end of the rotor to improve maintainability, the output of this brushless exciter increases as the output of the rotating electrical machine increases. However, the transmission torque has increased.

  It is conceivable to cope with the increase in the current by increasing the cross-sectional area of the current circuit. For example, regarding the stud, it is possible to cope with the increase in current by increasing the cross-sectional area of the current circuit by increasing the diameter or increasing the number of studs. However, since it is necessary to ensure the shear strength of the rotor with respect to the transmission torque of the rotor shaft, the diameter of the shaft cannot be increased at the end portion of the current collecting ring having a peripheral speed limit. The radial stud hole communicating from the shaft center hole to the outer periphery of the shaft is a concentrated portion of shear stress generated in the shaft. For this reason, depending on the magnitude of the torque, a stud hole cannot be formed in the shaft.

  As a method of eliminating the need for the radial stud hole, there is a structure in which a conductor is arranged in the radial direction on the end face of the rotor and this conductor is electrically connected by tightening the end face of the center hole conductor with a bolt.

JP 2013-017307 A

  However, the structure in which the conductor arranged in the radial direction on the rotor end face is fastened to the end face of the center hole conductor with a bolt and electrically connected cannot secure the necessary and sufficient contact area for the increase in current only by the end face of the center hole conductor. There is a fear.

  The problem to be solved by the present invention is that the center hole conductor for supplying power to the rotor coil and the conductor outside the center hole can be electrically connected with a sufficient contact area secured. The present invention provides a rotating electrical machine and a method for manufacturing the rotating electrical machine.

  A rotating electrical machine according to an embodiment is a gas-cooled rotating electrical machine in which a cooling gas flows between a rotor and a stator, and the rotor includes a center hole along a rotation center of the rotor, and the rotor A shaft having a stud hole communicating with the outer peripheral surface of the rotor in the radial direction from the center hole at the machine inner end of the center hole is electrically insulated from the shaft and electrically insulated from each other. At least a pair of center hole conductors that are inserted in the center hole along the center of rotation in a state of being electrically insulated, and each projecting toward the end of the shaft, and an end of the shaft At least a pair of end conductors which are electrically insulated from the shaft on the side and are electrically connected with the side surfaces of the projecting portions of the at least one pair of center hole conductors as electrical connection surfaces , Comprising a.

  Further, the manufacturing method of the rotating electrical machine according to one embodiment includes a shaft in which a center hole along the rotation center and a stud hole that communicates from the center hole to the outer peripheral surface in the radial direction at the machine inner end of the center hole. A rotor is provided, and at least a pair of center hole conductors each having a projecting portion projecting toward the end of the shaft are electrically insulated from the shaft and electrically insulated from each other. The at least one pair of end conductors inserted into the center hole along the center of rotation and electrically insulated from the shaft are electrically connected to the side surfaces of the protrusions of the at least one pair of center hole conductors. Connected.

  According to the present invention, the center hole conductor for supplying electric power to the coil of the rotor and the conductor outside the center hole can be electrically connected while securing a sufficient contact area.

The figure which shows an example of the rotary electric machine in 1st Embodiment. Sectional drawing which shows an example of the edge part of the rotor of the rotary electric machine in 1st Embodiment. Sectional drawing which shows an example of the edge part of the rotor of the rotary electric machine in 1st Embodiment. The BB arrow line view in FIG. 2 which shows an example of the edge part of the rotor of the rotary electric machine in 1st Embodiment. The perspective view of the edge part conductor of the rotor of the rotary electric machine in 1st Embodiment. The perspective view of the edge part conductor of the rotor of the rotary electric machine in 1st Embodiment. Sectional drawing which shows an example of the edge part of the rotor of the rotary electric machine in 2nd Embodiment. Sectional drawing which shows an example of the edge part of the rotor of the rotary electric machine in 3rd Embodiment. Sectional drawing which shows an example of the edge part of the rotor of the rotary electric machine in 3rd Embodiment. Sectional drawing which shows an example of the edge part of the rotor of the rotary electric machine in 4th Embodiment. CC arrow figure in FIG. 10 which shows an example of the edge part of the rotor of the rotary electric machine in 4th Embodiment. The perspective view which shows an example of the edge part of the rotor of the rotary electric machine in 4th Embodiment. Sectional drawing which shows an example of the edge part of the rotor of the rotary electric machine in 5th Embodiment. The DD arrow view in FIG. 13 which shows an example of the edge part of the rotor of the rotary electric machine in 5th Embodiment. The perspective view which shows an example of the edge part of the rotor of the rotary electric machine in 5th Embodiment. Sectional drawing which shows an example of the edge part of the rotor of the rotary electric machine in 6th Embodiment. The EE arrow line view in FIG. 16 which shows an example of the edge part of the rotor of the rotary electric machine in 6th Embodiment.

Hereinafter, embodiments will be described with reference to the drawings.
(First embodiment)
First, the rotating electrical machine according to the first embodiment will be described with reference to FIGS. 1, 2, 3, 4, 5, and 6. FIG. 1 is a diagram illustrating an example of a rotating electrical machine according to the first embodiment. 2, 3, and 4 are cross-sectional views illustrating an example of an end portion of the rotor of the rotating electrical machine according to the first embodiment. However, FIG. 3 is an enlarged view of a portion A shown in FIG. 2, and FIG. 4 is a view taken along the line BB in FIG. FIG. 5 is a perspective view of the end conductor shown in FIG. FIG. 6 is a perspective view of the center hole conductor shown in FIG.
A rotating electrical machine 1 shown in FIG. 1 is a gas-cooled rotating electrical machine in which a cooling gas flows between a rotor 2 and a stator 3.
A stator 3 disposed on the outer periphery of the rotor 2 is attached to an inner surface of a stator frame (frame) 4. The end 2 </ b> A of the rotor 2 extends through the stator frame 4, is supported by the bearing 5, and is cooled into the stator frame 4 by the oil seal 6 at a position closer to the center than the bearing 5. Is sealed.
Electric power is supplied to the coil 7 mounted to excite the iron core 2B of the rotor 2 from the outside through the current collecting rings 214 and 224 of the end 2A of the rotor 2.

  As shown in FIG. 2, the rotor 2 of the rotating electrical machine 1 includes a shaft 20 having a central hole 201 formed in the center as a main component. The rotor 2 includes a coil 7, center hole conductors 211 and 221, end conductors 212 and 222, and radial studs 213 and 223 as field circuit components. The center hole conductor 211, the end conductor 212, the radial stud 213 and the center hole conductor 221, the end conductor 222, and the radial stud 223 are positioned 180 ° apart from each other across the center hole 201.

  As shown in FIG. 2, the rotor 2 has current collecting rings 214 and 224 mounted on the outer periphery of the shaft 20 extending outward from the frame 4. The current collecting rings 214 and 224 are mounted side by side in the axial direction of the shaft 20 while being electrically insulated from the shaft 20 by an insulating member, and the outer peripheral surface is electrically connected by sliding with the power supply brush. (Electrical connection). The insulation described below refers to electrical insulation.

  In the shaft 20, a center hole 201 and a stud hole 202 on the inside of the machine are formed at the end 2 </ b> A on the side where the power feeding device is connected. The center hole 201 is formed along the rotation center L. The stud hole 202 communicates radially from the center hole 201 to the outer peripheral surface of the shaft 20 near the coil 7 and is symmetrical with respect to the rotation center L as shown in FIG. They are formed 180 degrees apart.

The pair of center hole conductors 211 and 221 are inserted into the center hole 201 in the direction along the rotation center L while being electrically insulated from the shaft 20 and from each other. In addition, since this embodiment has described a two-pole rotating electric machine as an example, a pair of center hole conductors 211 and 221 are inserted. However, in a rotating electric machine having four or more poles, depending on the number of poles A pair of center hole conductors 211 and 221 are provided by being inserted into the center hole 201 while being electrically insulated from each other. That is, in this embodiment, the center hole conductors 211 and 221 are provided in at least one pair.
An insulating plate 262 is inserted between the center hole conductors 211 and 221 to electrically insulate them from each other. A center hole conductor insulating tube 261 is mounted between the center hole conductors 211 and 221 and the inner periphery of the center hole 201 facing the center hole conductors 211 and 221. An insulating block 263 is inserted between the shaft end 2 </ b> A and the pair of end conductors 212 and 222. Note that the end conductors 212 and 222 are also provided in at least one pair as in the case of the center hole conductors 211 and 221.
An insulating plate 264 is inserted between the end conductor 212 and the end face of the shaft 20 to electrically insulate them from each other. The insulating plate 264 is also inserted between the end conductor 222 and the end surface of the shaft 20.

  The radial studs 213 and 223 are respectively inserted into the stud holes 202 that are 180 ° apart while being electrically insulated from the shaft 20. The radial stud 213 electrically connects the lead conductor 7 </ b> A of the coil 7 and the center hole conductor 211. Similarly, the radial stud 223 electrically connects the lead conductor 7 </ b> B of the coil 7 and the center hole conductor 221.

The radial stud 213 is connected to the end of the coil 7 prepared as one of the bend parts (not shown) by the lead conductor 7A. Similarly, the radial stud 223 is connected to the end portion of the coil 7 prepared as one of the bend portions as described above by the lead conductor 7B.
The lead conductors 7A and 7B are accommodated in slots formed on the outer peripheral surface of the shaft 20 along the direction along the rotation center L.

As shown in FIG. 2, at the end of the shaft 20, the end conductors 212 and 222 and the current collecting rings 214 and 224 are electrically connected to each other on a one-to-one basis.
The current collecting rings 214 and 224 are attached to the outer periphery of the end portion of the shaft 20 via the current collecting ring insulating cylinder 271, and are attached to the fixed-side power feeding device on the outer peripheral surfaces of the current collecting rings 214 and 224. Electrical connection is made by sliding with the power supply brush.

As shown in FIG. 3, an insulating plug 265 having holes 265A and 265B through which the ends of the center hole conductors 211 and 221 pass is housed in the end of the center hole 201.
Further, a gasket 281 is formed in a groove formed on the outer peripheral surface of the end portion of the center hole conductor 211 (inner side of the center hole conductor end portion 211A as a protruding portion) so as to face the inner periphery of the through hole 265A of the insulating plug 265. Is fitted between the outer peripheral surface and the insulating plug 265 to provide a gas seal. Similarly, a gasket is formed in a groove formed opposite to the inner periphery of the through hole 265B of the insulating plug 265 on the outer peripheral surface of the end portion of the center hole conductor 221 (the inner side from the center hole conductor end portion 221A as the protruding portion). By fitting 282, gas sealing is performed between the outer peripheral surface and the insulating plug 265. Further, a gas seal is provided between the insulating plug 265 and the inner peripheral surface of the center hole 201 by fitting a gasket 283 into a groove formed on the outer periphery of the insulating plug 265.

  In the first embodiment, the center hole conductor end portions 211A and 221A as the projecting portions are cylindrical, and the end conductor 212 has an outer peripheral surface (side surface) of the center hole conductor end portion 211A on the end side of the shaft 20. That is, a surface having a circumferential component such as a circumferential surface with respect to the rotation center L) is provided as an electrical connection surface, and a hole into which the center hole conductor end 211A can be fitted is provided. ing. The inner diameter of the hole is generally matched with the outer diameter of the center hole conductor end portion 211A, and the axial length is matched with the axial length of the outer peripheral surface of the center hole conductor end portion 211A. Formed along. Similarly, the end conductor 222 includes an inner peripheral surface electrically connected to the outer peripheral surface (side surface) of the center hole conductor end portion 221A on the end portion side of the shaft 20 as an electric connection surface. A hole into which the end 221A can be fitted is provided. The inner diameter of this hole is matched with the outer diameter of the center hole conductor end 221A, and the axial length is matched with the axial length of the outer peripheral surface of the center hole conductor end 221A in the axial direction. Formed along. The inner peripheral surfaces of the holes provided in the end conductors 212 and 222 are electrical connection surfaces on the end conductors 212 and 222 side, respectively.

Each of the end conductors 212 and 222 is provided with a slit 212A (on the end conductor 212 side) and 222A (on the end conductor 222 side) that communicate with the holes into which the center hole conductor end portions 211A and 221A can be fitted, respectively. It is done.
Also, with the outer peripheries of the center hole conductor end portions 211A and 212A fitted in these holes, the gap between the slits is narrowed so that the outer peripheral surface (side surface) of the center hole conductor end portion 211A and the hole of the end conductor 212 are reduced. Bolts 231 and nuts which are fastening members for applying contact surface pressure to the electrical connection surface with the inner peripheral surface and the electrical connection surface between the outer peripheral surface of the center hole conductor end 221A and the inner peripheral surface of the hole of the end conductor 222 232 can be attached so as to clamp the end conductors 212 and 222 in the circumferential direction.

Specifically, as shown in FIG. 3, the end conductor 212 is closer to the end of the shaft 20 than the insulating plug 265, and the end conductor 212 is a cylindrical center hole conductor end 211A (FIG. 6). A cylindrical hole for fitting a reference) is formed, and as shown in FIGS. 4 and 5, a slit 212A is formed in a part of the hole.
Similarly, as shown in FIG. 3, the end conductor 222 is located on the end side of the shaft 20 with respect to the insulating plug 265, and the end conductor 222 has a cylindrical center hole conductor end 221 </ b> A for fitting into the end conductor 222. A cylindrical hole is formed, and as shown in FIG. 4, a slit 222A is formed in a part of the hole.
Here, with the center hole conductor end portions 211A and 221A fitted into the holes of the end conductors 212 and 222 in a one-to-one relationship, the bolts 231 and nuts 232 are tightened to narrow the widths of the slits 212A and 222A. By applying force, the inner diameters of the holes of the end conductors 212 and 222 are reduced, and the entire contact surface between the inner peripheral surfaces of the holes of the end conductors 212 and 222 and the outer peripheral surfaces of the center hole conductor end portions 211A and 221A The contact surface pressure can be applied to the surface to efficiently secure the area of the electrical connection surface within the narrow space in the center hole 201.

In the rotary electric machine 1 according to the first embodiment configured as described above, the field current supplied from the positive-side power supply brush that is electrically connected to the outer periphery of the current collecting ring 214 by sliding is an end portion. It passes through the conductor 212, the center hole conductor 211, and the radial stud 213, and is supplied to the coil 7 from the lead conductor 7A. This current returns from the lead conductor 7B through the radial stud 223, the center hole conductor 221, and the end conductor 222 to the negative-side power supply brush that is electrically connected to the outer periphery of the current collecting ring 224 by sliding.
By this field current, the iron core 2B of the rotor 2 is excited, and when the rotor 2 is rotated by an external driving force from a steam turbine or the like, an electromotive force is generated in the stator to generate power.

Therefore, in the first embodiment, without significantly increasing the size of the bolts 231 and without significantly increasing the number of the bolts 231, the inner peripheral surfaces of the holes of the end conductors 212 and 222, and the center hole conductor end A uniform contact surface pressure can be efficiently applied to the entire contact surface between the outer peripheral surfaces of the portions 211A and 221A.
In the present embodiment, the end conductors 212 and 222 are arranged at the end 2A of the rotor 2 without making any radial hole other than the stud hole 202 in the shaft 20, and the end of the center hole 201 is formed. Even in a narrow space, the contact area for electrical connection can be greatly increased as the current value increases.

  Note that a plurality of radial studs 213 and 223 may be arranged in the axial direction in order to limit the field current that flows per radial stud when the output of the rotating electrical machine 1 increases. .

(Second Embodiment)
Next, a second embodiment will be described with reference to the drawings. In addition, the fundamental structure of the rotor 2 of the rotary electric machine 1 in each following embodiment is the same as 1st Embodiment. Therefore, in the following embodiments, components having the same functions are denoted by the same reference numerals in the respective drawings, and the detailed description will refer to the description of the first embodiment and the drawings.

In the second embodiment, in order to supply a field current to the coil 7 of the rotor 2, instead of the configuration in which the current collecting rings 214 and 224 are in sliding contact with the brush as in the first embodiment, brushless excitation is used. Use the device.
FIG. 7 is a cross-sectional view illustrating an example of an end portion of the rotor of the rotating electrical machine according to the second embodiment. As shown in FIG. 7, in the second embodiment, the end conductors 212 and 222 are connected to the end face of the rotor 2 by a shaft coupling to connect the end conductors 212 and 222 to the end face of the rotor 2. The output conductors 312 and 322 are electrically connected in a one-to-one relationship. Thereby, a field current can be supplied from the brushless exciter to the coil 7 of the rotor 2.

In other words, by connecting the electrical connection surfaces, which are the end surfaces of the output conductors 312 and 322 of the rotor 9 of the brushless exciter, to the end surface of the rotor 2 of the rotating electrical machine 1 with the shaft coupling, Electrical contact is made by applying contact surface pressure to the electrical connection surfaces between the end surfaces of 212 and 222 and the end surfaces of the output conductors 312 and 322.
Thus, even when a brushless exciter is used to supply a field current to the coil 7 of the rotor 2, as in the first embodiment, the contact for electrical connection is made in accordance with the increase in the current value. The area can be greatly increased.

  At this time, further contact surface pressure is applied to the electrical connection surface by a method such as inserting a spring 343 near one end along the radial direction of the electrical connection surface of the output conductors 312 and 322 and the back side viewed from the other end. You can also.

(Third embodiment)
Next, a third embodiment will be described with reference to FIGS.
FIG. 8 and FIG. 9 are sectional views as seen from the radial direction showing an example of an end portion of the rotor of the rotating electrical machine according to the third embodiment.
In the third embodiment, the outer peripheries (side surfaces) as the electrical connection surfaces of the center hole conductor end portions 211A and 221A have a conical shape whose diameter is smaller toward the end portion of the shaft 20 when viewed from the inside of the machine. The outer peripheries of the portions 211A and 221A have a first inclination with respect to the rotation center L. That is, the outer peripheral surfaces (side surfaces) as the electrical connection surfaces of the center hole conductor end portions 211A and 221A that are the protruding portions of the center hole conductors 211 and 221 are inclined with respect to the circumferential surface of the rotation center L. The shapes of the holes formed in the end conductors 212 and 222 are generally matched with the outer peripheries of the center hole conductor end portions 211A and 221A fitted into the holes. The electrical connection surface disposed on the inner peripheral surface of the hole has a second inclination with respect to the rotation center L, which is smaller than the first inclination, and the electrical connection surface on the end conductors 212 and 222 side. Similarly, the inner circumferential surface of the hole is inclined with respect to the circumferential surface of the rotation center L.

In the state where the center hole conductor end portions 211A and 221A are fitted in the holes, the holes of the end conductors 212 and 222 and the center hole conductor end portions 211A and 221A are caused by the difference between the first and second inclinations. There is a gap between the outer periphery of the two.
A bolt 231 and a nut 232 for reducing the gap can be attached to the side of the end conductors 212 and 222 where the cone diameter is small, that is, the end side of the rotor 2.

  Specifically, as shown in FIGS. 8 and 9, the inclination (second inclination) of the inner periphery of the hole of the end conductor 212 is changed to the inclination (first inclination) of the outer periphery of the center hole conductor end 211A. The inclination of the inner periphery of the hole of the end conductor 222 is made smaller than the inclination of the outer periphery of the center hole conductor end 221A.

Then, the bolt 231 and the nut 232 are arranged near the end of the rotor 2 in the end conductors 212 and 222, and the bolt 231 and the nut 232 are connected to the holes of the end conductors 212 and 222 and the end of the center hole conductor. When the gap between the outer portions of the portions 211A and 221A starts to be reduced, the contact surface pressure starts to be applied to the electrical connection surface on the machine inner side earlier than the electrical connection surface on the end side. . Then, by further tightening the bolt 231 and the nut 232, the contact surface pressure is finally applied to the entire surface of the electrical connection surface.
As described above, in the third embodiment, as the field current further increases, the inner peripheral surface of the hole of the end conductor and the outer periphery of the end of the central hole conductor as it goes from the outside to the inside of the center hole 201. The electrical connection surface with the surface is enlarged. Therefore, even if the bolt 231 and the nut 232 are disposed only on the end side where the tightening operation can be performed, the contact surface pressure can be applied to the inside of the center hole 201, so that the area of the electrical connection surface can be reduced. It can be secured.

(Fourth embodiment)
Next, a fourth embodiment will be described with reference to FIG. 10, FIG. 11, and FIG. FIG. 10 is a cross-sectional view seen from the radial direction showing an example of an end portion of the rotor of the rotating electrical machine according to the fourth embodiment. FIG. 11 is a CC arrow view in FIG. 10 illustrating an example of an end portion of the rotor of the rotating electrical machine according to the fourth embodiment. FIG. 12 is a perspective view illustrating an example of an end portion of a rotor of a rotating electrical machine according to the fourth embodiment.
As shown in FIGS. 10 and 11, in the fourth embodiment, the outer periphery of the end conductors 212 and 222 in the vicinity of the electrical connection surface with the center hole conductor end portions 211A and 221A is cylindrical. Hereinafter, this cylindrical portion is referred to as a cylindrical portion. Outer cylinders 212 </ b> B and 222 </ b> B having a higher rigidity than the material of the member of the cylindrical portion can be arranged on the cylindrical portion using a bolt 231 and a nut 232 on a one-to-one basis. The outer cylinders 212B and 222B are, for example, spring steel.
Generally, as the end conductors 212 and 222, a material such as copper having a small electric resistance is used. However, since the rigidity thereof is not high, it may be deformed.
In the fourth embodiment, the shape of the cylindrical portion of the end conductors 212 and 222 can be kept constant by supplementing the rigidity of the end conductors 212 and 222 with the outer cylinder having high rigidity as described above. it can. Therefore, stable electrical connection between the inner peripheral surfaces of the holes of the end conductors 212 and 222 and the outer peripheral surfaces of the center hole conductor end portions 211A and 221A can be maintained.
The same effect can be expected when the outer cylinders 212B and 222B are applied to the third embodiment.

(Fifth embodiment)
Next, a fifth embodiment will be described with reference to FIGS. 13, 14, and 15. FIG. FIG. 13: is sectional drawing seen from the radial direction which shows an example of the edge part of the rotor of the rotary electric machine in 5th Embodiment. FIG. 14 is a DD arrow view in FIG. 13 illustrating an example of an end portion of the rotor of the rotating electrical machine according to the fifth embodiment. FIG. 15 is a perspective view illustrating an example of an end portion of a rotor of a rotating electrical machine according to the fifth embodiment.
As shown in FIGS. 13, 14, and 15, in the fifth embodiment, the bolt 231 and the nut 232 as described in the fourth embodiment are not used. In the fifth embodiment, the outer cylinders 212B and 222B described in the fourth embodiment are provided with slits, and spacers are inserted into the slits to expand the inner diameters of the outer cylinders 212B and 222B. can do. Thus, the outer cylinders 212B and 222B whose inner diameters are expanded can be arranged one-to-one on the outer periphery of the cylindrical portion of the end conductors 212 and 222 described in the fourth embodiment.

  Here, the inner diameters of the outer cylinders 212B and 222B in a state where the outer cylinders 212B and 212B are not arranged on the outer periphery of the cylindrical portion of the end conductors 212 and 222 as described above and the inner diameter is not expanded are outside these cylinders. When the center hole conductor end portions 211A and 221A are fitted into the holes of the end conductors 212 and 222 where the tubes 212B and 222B are not disposed, the outer diameter of the cylindrical portion of the end conductors 212 and 222 is made smaller. Produced.

  The above-described operation for fitting the holes of the end conductors 212 and 222 and the center hole conductor ends 211A and 221A is performed by inserting a spacer into the slit of the outer cylinders 212B and 222B as described above. , 222B, and the outer cylinders 212B, 222B are arranged on the outer circumference of the cylindrical portion of the end conductors 212, 222 in a one-to-one manner. Then, after the center hole conductor end portions 221A and 221A are fitted into the holes of the end portion conductors 212 and 222 on a one-to-one basis, the spacers of the outer cylinders 212B and 222B can be extracted from the slits.

As described above, when the spacers are extracted from the slits of the outer cylinders 212B and 222B, a force is generated to return the inner diameters of these outer cylinders 212B and 222B. In the fifth embodiment, by using this force, contact surface pressure is applied to the electrical connection surface between the inner peripheral surface of the hole of the end conductors 212 and 222 and the outer peripheral surface of the center hole conductor end portions 211A and 221A. Can do.
In this method, contact surface pressure can be applied to the electrical connection surfaces between the inner peripheral surfaces of the holes of the end conductors 212 and 222 and the outer peripheral surfaces of the center hole conductor end portions 211A and 221A without using bolts and nuts. . For this reason, an operation space for tightening these bolts and nuts becomes unnecessary. The same effect can be expected when the outer cylinders 212B and 222B described in the fifth embodiment are applied to the third embodiment.

(Sixth embodiment)
Next, a sixth embodiment will be described with reference to FIGS. 16 and 17. FIG. 16: is sectional drawing seen from the radial direction which shows an example of the edge part of the rotor of the rotary electric machine in 6th Embodiment. FIG. 17 is an EE arrow view in FIG. 16 illustrating an example of an end portion of the rotor of the rotating electrical machine according to the sixth embodiment.
As shown in FIGS. 16 and 17, in the sixth embodiment, cylindrical center hole conductor end portions 211A and 221A are provided as projecting portions as in the first embodiment, and the center hole conductor end portions 211A, Instead of a configuration in which the side surface of 221A is fitted into a hole provided in the end conductor as an electrical connection surface, center hole conductor end portions 211B and 221B which are protrusions on the rotor end side of the center hole conductors 211 and 221 are provided. Is provided so as to cut out a part of the rotation center L side (that is, the insulating plate 262 side) among the rotor end portions of the center hole conductors 211 and 221. In other words, each of the center hole conductors 211 and 221 has a part away from the bottom surface facing the insulating plate 262, that is, a part of the side surface of the center hole conductors 211 and 221 away from the rotation center L. The hole conductors 211 and 221 are provided as center hole conductor end portions 211 </ b> B and 221 </ b> B, respectively, which are protrusions protruding toward the rotor end portion side. These center hole conductor end portions 211B and 221B are electrically insulated from each other and electrically insulated from the shaft 20, respectively.

  In the present embodiment, among the side surfaces of the center hole conductor end portions 211B and 221B, part of the center hole conductors 211 and 221 on the side of the rotation center L is cut out to form the inner surface of the center hole 201. The first plane and the second plane that are not opposed to each other are used as electrical connection surfaces. In particular, in the present embodiment, each of the first plane and the second plane is configured as a plane that is separated from the bottom surface facing the insulating plate 262 in the normal direction and substantially parallel to the bottom surface facing the insulating plate 262. Note that the first plane and the second plane, which are electrical connection surfaces, have a predetermined angle with respect to these surfaces, in addition to being parallel to the surfaces of the center hole conductors 211 and 221 facing the insulating plate 262. You may comprise so that it may have. Further, the entire side surface of the center hole conductor end portions 211B and 221B may be used as the electrical connection surface.

  That is, in this embodiment, when the center hole conductors 211 and 221 are electrically insulated from the center hole 201 via the insulating plate 262 and inserted along the rotation center L, the end side of the shaft 20 When viewed from above, a depression is formed so as to straddle a horizontal straight line at the rotation center L where the insulating plate 262 is disposed. In this recess, the first plane on the center hole conductor 211 side and the second plane on the center hole conductor 221 side face each other through a horizontal straight line to the rotation center L on which the insulating plate 262 is disposed. Formed respectively.

The end conductor 212 is formed with a substantially L-shaped first end conductor protrusion having an electrical connection surface with a first plane which is an electrical connection surface of the center hole conductor 211, and the end conductor In 222, a substantially L-shaped second end conductor protrusion having an electrical connection surface with a second plane which is an electrical connection surface of the center hole conductor 221 is formed.
These first and second end conductor protrusions are connected to a pressure wedge or spring, which will be described later, in a state of being electrically connected to the first and second planes of the center hole conductors 211 and 221 in a one-to-one manner. A space that can be arranged is formed in the vicinity of the rotation center L.

That is, the space between the first and second end conductor protrusions is an electrical insulator that insulates the paired first end conductor protrusion and second end conductor protrusion. A pressure wedge can be placed. Specifically, the space includes a pressure wedge facing the surface near the rotation center L in the first end conductor protrusion of the end conductor 212 electrically connected to the first plane of the protrusion of the center hole conductor 211. 266A and a pressure wedge 266B facing the surface near the rotation center L in the second end conductor projection of the end conductor 222 electrically connected to the second plane of the projection of the center hole conductor 221; They are arranged side by side along the radial direction with a predetermined gap in which springs to be described later can be arranged.
In the pressure wedge 266A arranged as described above, the surface facing the first end conductor protrusion of the end conductor 212 electrically connected to the first plane of the center hole conductor 211, and as described above The surface of the arranged pressure wedge 266B facing the second end conductor protrusion of the end conductor 222 electrically connected to the second plane of the center hole conductor 221 has a predetermined inclination with respect to the rotation center L. Thus, it is formed to be an inclined surface that is separated from the center of rotation L as it goes from the end side toward the inside of the machine.

Further, the spring 243 can be inserted into the gap between the pressure wedges 266A and 266B arranged as described above.
Further, the surface of the first end conductor protruding portion of the end conductor 212 electrically connected to the first plane of the center hole conductor 211, the surface facing the pressure wedge 266A arranged as described above, and the center hole The surface of the second end conductor projecting portion of the end conductor 222 electrically connected to the second plane of the conductor 221 that faces the pressure wedge 266B arranged as described above is also inclined by the pressure wedges 266A and 266B. And an inclined surface that is separated from the rotation center L from the end side toward the aircraft inner side.

In the sixth embodiment, the bolt 231 is tightened along the axial direction with respect to the end conductors 212 and 222. By this tightening, the end conductors 212 and 222 are pushed into the machine from the end side of the shaft 20, whereby the inclined surfaces of the pressure wedges 266A and 266B receive a force, respectively, and the spring 243 between the pressure wedges 266A and 266B Compressed. Thereby, a repulsive force of the spring 243 is generated, and the repulsive force causes an electrical connection surface between the end conductor 212 and the center hole conductor 211 on the rotor end side, and a rotor of the end conductor 222 and the center hole conductor 221. Contact surface pressure can be applied to the electrical connection surface with the end side.
Thus, the sixth embodiment can obtain the same effects as those of the first embodiment even when an air-cooled rotating electrical machine that does not require a gas seal structure is used.

  In addition, although some embodiment of this invention was described, these embodiment is shown as an example and is not intending limiting the range of invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 1 ... Rotary electric machine, 2 ... Rotor, 2A ... End part, 2B ... Iron core part, 3 ... Stator, 4 ... Stator frame, 5 ... Bearing, 6 ... Oil seal, 7 ... Coil, 7A, 7B ... Lead-out conductor , 8 ... Rotor of driving machine, 9 ... Rotor of brushless exciter, 20 ... Shaft, 201 ... Center hole, 202 ... Stud hole, 211, 221 ... Center hole conductor, 211A, 211B, 221A, 221B ... Center Hole conductor end, 212, 222 ... end conductor, 212A, 222A ... slit, 212B, 222B ... outer cylinder, 213, 223 ... radial stud, 214, 224 ... current collecting ring, 231 ... bolt, 232 ... nut, 243, 343 ... Spring, 261 ... Center hole conductor insulating cylinder, 262 ... Insulating plate, 263 ... Insulating block, 264 ... Insulating plate, 265 ... Insulating plug, 266A, 266B ... Pressure wedge, 271 Collector ring insulation tube, 281, 282, 283 ... gasket, 312, 322 ... output conductor.

Claims (9)

A gas-cooled rotary electric machine in which a cooling gas flows between a rotor and a stator,
The rotor is
A shaft formed with a center hole along the rotation center of the rotor, and a stud hole that communicates radially from the center hole to the outer peripheral surface of the rotor at the machine inner end of the center hole;
Protrusions that are electrically insulated from the shaft and are electrically insulated from each other, inserted into the center hole along the center of rotation, and projecting toward the end of the shaft. At least a pair of central hole conductors provided;
At least a pair of electrical terminals that are electrically insulated from the shaft on the end side of the shaft and are electrically connected with the side surfaces of the projecting portions of the at least one pair of center hole conductors as electrical connection surfaces. End conductors,
A rotating electric machine comprising:   The rotating electrical machine according to claim 1, wherein each of the end conductors is provided with a hole into which the protruding portion can be fitted. For the end conductor,
A slit communicating with the hole;
A fastening member capable of narrowing the width of the slit;
The rotating electrical machine according to claim 2, further comprising: The side surface of the protrusion at the end of the center hole conductor is inclined with respect to the circumferential surface with respect to the rotation center.
The rotating electrical machine according to claim 1 or 2, characterized in that An insulating plug that electrically insulates between the center hole conductor and the shaft at an end of the center hole conductor and seals the cooling gas;
A gasket that is disposed along an axial direction between the end of the center hole conductor and the insulating plug and between the insulating plug and the center hole of the shaft to seal the cooling gas; The rotating electrical machine according to any one of claims 1 to 4, wherein the rotating electrical machine is provided. Each of the protrusions is provided so as to cut out a part of the center hole conductor on the side of the rotation center,
2. The rotating electrical machine according to claim 1, wherein each of the electrical connection surfaces is a flat surface formed by cutting out a part of the center hole conductor in each of the side surfaces of the projecting portion.   The rotating electrical machine according to claim 6, wherein an electrical insulator that insulates between the pair of end conductors is disposed between the at least one pair of end conductors. The rotating electrical machine according to any one of claims 1 to 7, wherein the end conductor is electrically connectable to an output conductor of a brushless exciter. Preparing a rotor comprising a shaft formed with a center hole along the center of rotation, and a hole for studs communicating with the center hole from the center hole to the outer peripheral surface in the radial direction at the machine inner end of the center hole;
At least a pair of center hole conductors each having a projecting portion projecting toward the end of the shaft are electrically insulated from the shaft and electrically insulated from each other. Insert along the center of rotation,
Electrically connecting at least a pair of end conductors that are electrically insulated from the shaft to side surfaces of the protrusions of each of the at least a pair of center hole conductors;
The manufacturing method of the rotary electric machine characterized by the above-mentioned.